This work was testing Read & Cumming (2006), where we suggested that the brain could potentially deduce vertical disparity information from the pattern of (de)correlation across the visual field, without necessarily using cells tuned to a range of vertical disparities. In this paper, we tried to construct a stimulus for which this strategy would fail. We found that perception carried on just the same, thus shooting down the model of Read & Cumming (2006) in its present form.